Welcome!

News Feed Item

Integra Gold Reports up to 97.8% Gold Recovery in Phase 3 Metallurgical Testing

VANCOUVER, BRITISH COLUMBIA -- (Marketwired) -- 02/25/14 -- Press release highlights:

--  Gold recovery of up to 97.8% for the Parallel Zone composite samples
    using a combination of gravity and Carbon-in-Leach ("CIL") cyanidation.
--  Test work completed by ALS Metallurgy ("ALS") in Kamloops, British
    Columbia, with supervision by WSP Group ("WSP") from Val-d'Or, Quebec
--  Phase 3 focused on applying recovery processes consistent with existing
    milling infrastructure in the region

Integra Gold Corp. (TSX VENTURE: ICG) ("Integra" or the "Company") is pleased to announce it has completed its Phase 3 metallurgical testing program at its Lamaque Gold Project in Val-d'Or, Quebec. The Phase 3 program was designed to individually assess the metallurgical response of samples from the project's four gold deposits using flowsheets that replicated the processes used by various mills in the immediate vicinity of the Lamaque Project. The Company is currently assessing the viability and availability of each of the mills and will incorporate these results into its future plans.

"Results of this program confirm that gold at the Lamaque Project can be efficiently recovered utilizing the same processing methodologies and flowsheets used in existing milling facilities in the immediate vicinity. We will use this positive metallurgical data to guide the next phase of our development plan, which is to assess all options and determine the best fit for the Company's needs moving forward. The fact that there are six potentially available mills included as part of this study speaks volumes about the infrastructure advantages this project has," commented Company President and CEO, Stephen de Jong. "The recent test work indicates that metallurgical gold recoveries can be optimized to over 95% which is consistent with what was achieved historically on similar types of mineralization at the neighbouring Lamaque and Sigma mines. Further metallurgical work is required for the Plug No. 4 material and we are confident there is significant room for optimization. We do not anticipate this will have a significant impact on our upcoming PEA as the initial phase of proposed production will focus on the Triangle and Parallel Zones."

The following table give a summary of Phase 3 optimized recoveries using a 96 hour leach time:

Phase 3 Metallurgical Testing - Gold Recoveries versus Metallurgical Process
                          (96 hour retention time)
  -----------------------------------------------------------------------
                                         Clusters and Zones
                           ----------------------------------------------
                               North Cluster           South Cluster
  -----------------------------------------------------------------------
  Metallurgical Process     Parallel    Fortune    Triangle   Plug No. 4
  -----------------------------------------------------------------------
  Process 1                     97.8%      96.6%       93.1%        87.6%
  -----------------------------------------------------------------------
  Process 2                     97.1%      95.6%       92.9%        83.2%
  -----------------------------------------------------------------------
  Process 3                     96.6%      97.1%       93.4%        85.1%
  -----------------------------------------------------------------------
  Process 4                     85.8%      82.0%       71.1%        58.4%
  -----------------------------------------------------------------------
Process 1 - Gravity concentration with CIL cyanide leach
Process 2 - Whole ore cyanide leach
Process 3 - Whole ore CIL cyanide leach
Process 4 - Flotation separation with cyanide leach of concentrate
(excluding leach of tails)

Summary of Phase 3 Metallurgical Testing

The metallurgical test program was completed by ALS on samples from the Lamaque deposits in Val-d'Or, Quebec on behalf of Integra, with supervision by WSP from Val-d'Or. The focus of this program was to test and compare four possible flowsheets, mirroring existing milling infrastructure in the region, on composites from four separate gold mineralized zones.

Four separate composites from the Parallel, Triangle, Fortune and No. 4 Plug zones were prepared from crushed drill core. The four composites were prepared to be at a median range of gold grade respective to each zone. Gold head assays were conducted using a screened metallic assaying method due to the coarse nugget effect of the gold in these deposits. The composites assayed 9.1, 8.8, 6.2 and 4.4 grams/tonne gold ("g/t Au") for the Parallel, Triangle, Fortune and No. 4 Plug composites, respectively.

Four flowsheets were tested on each sample. The first involved a gravity concentration followed by a Carbon-in-Leach ("CIL") cyanide leach of the gravity tails. The second was a whole ore cyanide leach and the third was a whole ore CIL. The fourth flowsheet involved a flotation separation (rougher and cleaner) followed by a separate cyanide leach of the flotation concentrate. Gold recoveries from the first three flowsheets were similar. Using these three flowsheets, and a 96 hour leach time, gold recoveries were as followed:

Parallel Zone Composite:                     96.6% to 97.8%
Triangle Zone Composite:                     92.9% to 93.4%
Fortune Zone Composite:                      95.6% to 97.1%
Plug No. 4 Zone Composite:                   83.2% to 87.6%

Using these same three flowsheets but with a 48 hour leach time, gold
recoveries were as followed:

Parallel Zone Composite:                     94.1% to 96.7%
Triangle Zone Composite:                     89.3% to 90.2%
Fortune Zone Composite:                      92.8% to 95.0%
Plug No. 4 Zone Composite:                   82.7% to 86.1%

The main difference between flowsheet performances was related to reagent consumption, with the CIL extractions consuming approximately twice as much sodium cyanide. In comparing the first three flowsheets, recovery differences were small enough that reagent consumptions and other economic factors relating to the use of the different processing facilities would likely be more significant than the metallurgical recovery differences.

The fourth flowsheet which involved gold recovery utilizing the flotation and cyanide leaching flowsheet produced significantly lower recoveries. This flowsheet, when not including the cyanide leach of the flotation tailings, had gold recovery substantially lower than the other flowsheets tested. Reagent consumptions for this flowsheet were also lower.

Testing Parameters

All flowsheets were tested with a primary grind sizing of 75um K80. Further testing with various grind sizes may be used in the future to further optimize test work.

The first flowsheet tested utilized a batch Knelson gravity concentrator with a hand panning of the gravity concentrate. Tailings from this gravity concentration underwent a 96 hour CIL cyanide test. The leaches were conducted at a pH of 11.0, with a sodium cyanide concentration of 1,000 ppm and with 30 grams per liter of carbon added to the leach slurry.

The second and third flowsheets were similar. The second flowsheet involved a 96 hour whole ore leach using 1,000 ppm sodium cyanide and a pH of 11.0. The third flowsheet used the same conditions as the second with the 96 hour leaches being CIL tests with 30 grams per liter of carbon added to the leach slurry.

The fourth flowsheet utilized flotation separation with a rougher separation followed by one stage of dilution cleaning. The flotation cleaner concentrate was subjected to a cyanide leach at 2,000 ppm sodium cyanide at pH of 11.0 for 96 hours. The flotation separations were conducted at natural pH with Potassium Amyl Xanthate (PAX) as a sulphide collector and Methyl Isobutyl Carbonyl (MIBC) as the frother.

No. 4 Plug Composites Future Testing

The No. 4 Plug composite has shown slightly lower overall gold recoveries when compared to material from other zones in all of the metallurgical processes tested. Before additional metallurgical testing is performed, and in order to fine-tune metallurgical recoveries for this zone, a mineralogical analysis of this ore type will be conducted. In previous testing work (see press release dated May 01, 2013 and July 25, 2013 on Phase 1 and 2 testing), finer grinding and more intense leach conditions had shown to optimize and improve performance significantly.

Project and Company Profile

Integra's Lamaque gold project is located in the heart of the Val-d'Or gold camp in the Province of Quebec, Canada, approximately 550 km northwest of Montreal. Quebec is rated one of the best mining jurisdictions in the world. Infrastructure, human resources and mining expertise are readily available.

The Company's primary objective is to continue to prove up additional resources while advancing the existing resource towards production. The project is divided into three main clusters of mineralization, the North, South and West Cluster. The North Cluster consists of the Parallel, Fortune, No. 5 Plug, and No. 3 Mine zones and is located approximately 1 km from the South Cluster, which includes the No. 4 Plug, Triangle and Triangle South zones. The Sixteen Zone and No. 6 Vein form the West Cluster.

Qualified Persons

The Lamaque exploration project is under the direct supervision of Herve Thiboutot, Eng. and Senior Vice-President of the company, and Francois Chabot, Eng. and Operations and Engineering Manager of the Company, both Qualified Person ("QP") as defined by National Instrument 43-101, and Alain-Jean Beauregard, P.Geo., Daniel Gaudreault, Eng., Geo. of Geologica Inc., and Michel Garon, Eng., M.A.Sc. of WSP Group in Val-d'Or, Quebec, all three independent QP as defined by National Instrument 43-101. The Company's QPs have reviewed the technical content of this release.

Quality Assurance - Quality Control ("QA/QC")

Thorough QA/QC protocols are followed on the project including insertion of duplicate, blank and standard samples in all drill holes. The core samples are submitted directly to ALS Laboratory Group and Bourlamaque Labs in Val-d'Or for preparation and analysis. Analysis is conducted on 1 assay-ton aliquots. Analysis of Au is performed using fire assay method with atomic absorption finish, with a gravimetric finish completed for samples exceeding 5 g/t Au, or a metallic sieve assay for samples containing visible gold. When available the gravimetric or metallic sieve assay results are used for the reported composite intervals.

ON BEHALF OF THE BOARD OF DIRECTORS

Stephen de Jong, CEO & President

Follow Integra Gold On:

- Twitter: http://twitter.com/integragoldcorp

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release.

Cautionary Note Regarding Forward Looking Statements:

No stock exchange, securities commission or other regulatory authority has approved or disapproved the information contained on this presentation. This presentation contains "forward-looking information" concerning Integra Gold Corp.'s ("Integra" or the "Company") future financial or operating performance and other statements that express management's expectations or estimates of future developments, circumstances or results. Generally, forward-looking information can be identified by the use of forward-looking terminology such as "seeks", "believes", "anticipates", "plans", "continues", "budget", "scheduled", "estimates", "expects", "forecasts", "intends", "projects", "predicts", "proposes", "potential", "targets" and variations of such words and phrases, or by statements that certain actions, events or results "may", "will", "could", "would", "should" or "might" "be taken", "occur" or "be achieved". Forward-looking statements included in this presentation include statements regarding potential mineralization and mineral resources, the proposed mining scenario for the South Lamaque Gold Project, including information with respect to the supporting infrastructure, the potential life of mine, rates of employment and the effects of steps taken to mitigate local impacts and the expected completion dates of exploration and drilling, exploration results, estimated and future exploration and administration expenditures, the completion of scoping studies, preliminary economic assessment, pre-feasibility or feasibility studies, and future plans and objectives of Integra. While all forward-looking statements involve various risks and uncertainties, these statements are based on certain assumptions that management of Integra believes are reasonable, including that it will be able to obtain financing and on reasonable terms, that its current exploration and other objectives can be achieved, that its exploration and other activities will proceed as expected, that its community and environmental impact procedures will work as anticipated, that general business and economic conditions will not change in a material adverse manner, that Integra will not experience any material accident, labour dispute or failure or shortage of equipment, and that all necessary government approvals for its planned exploration and potential development activities will be obtained in a timely manner and on acceptable terms.

There can be no assurance that the forward-looking statements will prove to be accurate and actual results and future events could differ materially from those anticipated in such statements. Important factors that could cause actual results to differ materially from the Integra's expectations include, among others, the actual results of current exploration activities being different than those anticipated by Integra, changes in project parameters as plans continue to be refined, changes in estimated mineral resources, future prices of metals, increased costs of labor, equipment or materials, availability of equipment, failure of equipment to operate as anticipated, accidents, effects of weather and other natural phenomena, risks related to community relations and activities of stakeholders, and delays in obtaining governmental approvals or financing. Although Integra has attempted to identify important factors that could cause actual results to differ materially, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such statements will prove to be accurate as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. Integra does not intend, and expressly disclaims any intention or obligation to, update or revise any forward-looking statements whether as a result of new information, future events or otherwise, except as required by law.

Contacts:
Corporate Inquiries:
Integra Gold Corp.
Chris Gordon
[email protected]
www.integragold.com

More Stories By Marketwired .

Copyright © 2009 Marketwired. All rights reserved. All the news releases provided by Marketwired are copyrighted. Any forms of copying other than an individual user's personal reference without express written permission is prohibited. Further distribution of these materials is strictly forbidden, including but not limited to, posting, emailing, faxing, archiving in a public database, redistributing via a computer network or in a printed form.

Latest Stories
Join IBM November 1 at 21st Cloud Expo at the Santa Clara Convention Center in Santa Clara, CA, and learn how IBM Watson can bring cognitive services and AI to intelligent, unmanned systems. Cognitive analysis impacts today’s systems with unparalleled ability that were previously available only to manned, back-end operations. Thanks to cloud processing, IBM Watson can bring cognitive services and AI to intelligent, unmanned systems. Imagine a robot vacuum that becomes your personal assistant tha...
Organizations do not need a Big Data strategy; they need a business strategy that incorporates Big Data. Most organizations lack a road map for using Big Data to optimize key business processes, deliver a differentiated customer experience, or uncover new business opportunities. They do not understand what’s possible with respect to integrating Big Data into the business model.
The session is centered around the tracing of systems on cloud using technologies like ebpf. The goal is to talk about what this technology is all about and what purpose it serves. In his session at 21st Cloud Expo, Shashank Jain, Development Architect at SAP, will touch upon concepts of observability in the cloud and also some of the challenges we have. Generally most cloud-based monitoring tools capture details at a very granular level. To troubleshoot problems this might not be good enough.
Nordstrom is transforming the way that they do business and the cloud is the key to enabling speed and hyper personalized customer experiences. In his session at 21st Cloud Expo, Ken Schow, VP of Engineering at Nordstrom, will discuss some of the key learnings and common pitfalls of large enterprises moving to the cloud. This includes strategies around choosing a cloud provider(s), architecture, and lessons learned. In addition, he’ll go over some of the best practices for structured team migrat...
Coca-Cola’s Google powered digital signage system lays the groundwork for a more valuable connection between Coke and its customers. Digital signs pair software with high-resolution displays so that a message can be changed instantly based on what the operator wants to communicate or sell. In their Day 3 Keynote at 21st Cloud Expo, Greg Chambers, Global Group Director, Digital Innovation, Coca-Cola, and Vidya Nagarajan, a Senior Product Manager at Google, will discuss how from store operations...
As people view cloud as a preferred option to build IT systems, the size of the cloud-based system is getting bigger and more complex. As the system gets bigger, more people need to collaborate from design to management. As more people collaborate to create a bigger system, the need for a systematic approach to automate the process is required. Just as in software, cloud now needs DevOps. In this session, the audience can see how people can solve this issue with a visual model. Visual models ha...
Recently, REAN Cloud built a digital concierge for a North Carolina hospital that had observed that most patient call button questions were repetitive. In addition, the paper-based process used to measure patient health metrics was laborious, not in real-time and sometimes error-prone. In their session at 21st Cloud Expo, Sean Finnerty, Executive Director, Practice Lead, Health Care & Life Science at REAN Cloud, and Dr. S.P.T. Krishnan, Principal Architect at REAN Cloud, will discuss how they bu...
SYS-CON Events announced today that Dasher Technologies will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Dasher Technologies, Inc. ® is a premier IT solution provider that delivers expert technical resources along with trusted account executives to architect and deliver complete IT solutions and services to help our clients execute their goals, plans and objectives. Since 1999, we'v...
When it comes to cloud computing, the ability to turn massive amounts of compute cores on and off on demand sounds attractive to IT staff, who need to manage peaks and valleys in user activity. With cloud bursting, the majority of the data can stay on premises while tapping into compute from public cloud providers, reducing risk and minimizing need to move large files. In his session at 18th Cloud Expo, Scott Jeschonek, Director of Product Management at Avere Systems, discussed the IT and busine...
Enterprises have taken advantage of IoT to achieve important revenue and cost advantages. What is less apparent is how incumbent enterprises operating at scale have, following success with IoT, built analytic, operations management and software development capabilities – ranging from autonomous vehicles to manageable robotics installations. They have embraced these capabilities as if they were Silicon Valley startups. As a result, many firms employ new business models that place enormous impor...
SYS-CON Events announced today that TidalScale, a leading provider of systems and services, will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. TidalScale has been involved in shaping the computing landscape. They've designed, developed and deployed some of the most important and successful systems and services in the history of the computing industry - internet, Ethernet, operating s...
We all know that end users experience the Internet primarily with mobile devices. From an app development perspective, we know that successfully responding to the needs of mobile customers depends on rapid DevOps – failing fast, in short, until the right solution evolves in your customers' relationship to your business. Whether you’re decomposing an SOA monolith, or developing a new application cloud natively, it’s not a question of using microservices – not doing so will be a path to eventual b...
In his session at 21st Cloud Expo, James Henry, Co-CEO/CTO of Calgary Scientific Inc., will introduce you to the challenges, solutions and benefits of training AI systems to solve visual problems with an emphasis on improving AIs with continuous training in the field. He will explore applications in several industries and discuss technologies that allow the deployment of advanced visualization solutions to the cloud.
SYS-CON Events announced today that Taica will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Taica manufacturers Alpha-GEL brand silicone components and materials, which maintain outstanding performance over a wide temperature range -40C to +200C. For more information, visit http://www.taica.co.jp/english/.
SYS-CON Events announced today that MIRAI Inc. will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. MIRAI Inc. are IT consultants from the public sector whose mission is to solve social issues by technology and innovation and to create a meaningful future for people.